//
//  UIColor+MMAdd.m
//  oc_demo
//
//  Created by haigui on 2021/8/5.
//

#import "UIColor+MMAdd.h"

@implementation UIColor (MMAdd)

/// 16进制颜色
/// @param color 字符串
+ (UIColor *)colorWithHexString:(NSString *)color{
    return [UIColor colorWithHexString:color alpha:1.0f];
}

/// 16进制颜色
/// @param color 字符串
/// @param alpha 透明度
+ (UIColor *)colorWithHexString:(NSString *)color alpha:(CGFloat)alpha{
        //删除字符串中的空格
    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
        // String should be 6 or 8 characters
    if ([cString length] < 6) {
        return [UIColor clearColor];
    }
        // strip 0X if it appears
        //如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾
    if ([cString hasPrefix:@"0X"]) {
        cString = [cString substringFromIndex:2];
    }
        //如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾
    if ([cString hasPrefix:@"#"]) {
        cString = [cString substringFromIndex:1];
    }
    if ([cString length] != 6) {
        return [UIColor clearColor];
    }

        // Separate into r, g, b substrings
    NSRange range;
    range.location = 0;
    range.length = 2;
        //r
    NSString *rString = [cString substringWithRange:range];
        //g
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
        //b
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];

        // Scan values
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    return [UIColor colorWithRed:((float)r / 255.0f) green:((float)g / 255.0f) blue:((float)b / 255.0f) alpha:alpha];
}

@end
